Some metals lose their lustre due to the effect of air and moisture, which can cause oxidation or tarnishing, making them appear dull or non-lustrous.
NCERT Book Curiosity Science Class 6
Class 6 Science NCERT Chapter 6.
Why do some metals lose their lustre over time?
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Some metals lose their lustre over time due to oxidation, tarnishing, or corrosion. Exposure to air, moisture, and environmental pollutants causes surface reactions that dull the metal’s shine. For instance, iron rusts, and silver tarnishes, reducing their reflective qualities.